Messi Biology notes that while many people associate magnesium hydroxide with its role as an antacid for gastrointestinal relief, its unique value in the field of oral care is less widely known. This white, odorless powder—with its mild chemical properties and safe biocompatibility—is becoming an “invisible guardian” in oral care products, playing a vital role in preventing cavities and alleviating oral discomfort.
The core application of magnesium hydroxide powder in the oral cavity is neutralizing acidity and preventing dental caries (cavities). When bacteria in the mouth break down food residue, they produce acidic substances that, over time, erode tooth enamel and lead to decay. As a weakly alkaline compound, magnesium hydroxide reacts with these acidic substances to produce neutral magnesium salts and water. This process quickly neutralizes the oral environment without irritating the mucous membranes due to excessive alkalinity. Today, an appropriate amount of magnesium hydroxide powder is added to many fluoride toothpastes and children’s oral care products. It forms a protective film on the tooth surface, reducing the erosion of enamel by acid, making it particularly suitable for individuals who frequently consume sweets or carbonated beverages.
Relieving oral ulcers is another major advantage. The lesions of oral ulcer patients are often accompanied by inflammation and the accumulation of acidic secretions, which intensify pain and slow down healing. The weak alkalinity of magnesium hydroxide powder can neutralize these acidic secretions, reducing the sensation of irritation. Simultaneously, the thin film it forms on the wound can isolate food debris and bacteria, creating a favorable environment for mucosal repair. Some oral ulcer powders and sprays incorporate magnesium hydroxide to provide gentle relief while avoiding the side effects associated with more potent medications, making it ideal for those with sensitive mouths.
Furthermore, magnesium hydroxide powder can assist in improving tooth sensitivity. The root cause of dentin hypersensitivity is the exposure of dentinal tubules, which allows external stimuli to be transmitted directly to the dental pulp nerve. The microscopic particles of magnesium hydroxide powder can adsorb onto the surface of the dentinal tubules, blocking these sensitivity channels and reducing the impact of stimuli such as hot, cold, sweet, or sour flavors on the nerves. Some desensitizing toothpastes formulate it alongside ingredients like potassium nitrate to provide both rapid relief and long-term protection for the teeth.
When using oral products containing magnesium hydroxide powder, it is important to follow the principle of moderation. Although its nature is mild, excessive use may disrupt the balance of normal oral flora or lead to dryness of the mucosa. As a natural and safe ingredient, magnesium hydroxide powder embodies the concept of “gentle tooth protection” through its unique chemical properties. From daily cavity prevention to the relief of oral discomfort, it guards oral health in a subtle yet effective way. With the advancement of technology, its applications in the oral field will continue to expand, bringing us more efficient and safer options for oral care.